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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd51b9c08bb6d7ff901d7bafa4f4d393d921d3fedabb0124cae093a3772751c1e' 
  AND token = '+wTSbNDe7DqXqRBZlOejUPZFzg5q2yZ2Zsmi0BsNM9A=' 
  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"
    }
  }
}