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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'eef25350159d43dfdc78a26df6527e0ca6ad749277ce41f508c75984c5604b56' 
  AND token = 'UGgrY9sGXKbWnuUlVyGa/ychkZAOjhZ8Qaf5tXycV1Q=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00050

JSON explain

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