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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1f0e6eb8c2b611ddfad3ce7488b4da6874891e1718ed363a7c1d0e7c2810671f' 
  AND token = 'LgSaUvdqx2b26yXTFHCskUwSQ9ixsRDyj/q7Lvwq97c=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00012

JSON explain

{
  "query_block": {
    "select_id": 1,
    "table": {
      "message": "Impossible WHERE noticed after reading const tables"
    }
  }
}