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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4a34988b3f3bddc397d470bdc6e3f4b73cdeb1f8e2b30fdc972ba6b84e36a3d6' 
  AND token = '7oyNhz0J74Z2/JLG3Z6Mo6R9C2IoIZfjkL3se3p+sI4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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