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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a5be7c8fe2e3dcd13e683d6327a4d76fc4f176492bc580b6cc03b6a4b6be58cc' 
  AND token = 'EhffczbGbdYXqbNdPL+WppryJjApyRPxdjTAvLzsgLs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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