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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0c88eae601c262b873f2c4e3bbe1e80a626d3642c80d5586973bdd094a834643' 
  AND token = 'U7jPdDGhrQw0Y/6kNCgR5s2tkv0JP7u2kF4kk4PpyAw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00044

JSON explain

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