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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1f51c3f42156b992d1f9c12f9ec10e01f04c22f4265852d76c787ef613f81d6a' 
  AND token = 'EYb7A3h1quLI3kKdMRLvc9SHnTPEMjkZ9Ie/o3LZOmg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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