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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '51ce19a2045478aea1109aa12d1339256612520088cdc24ca8dc224509431c82' 
  AND token = '2fkW10uZyS3Zmi27A/pRQ0KvXMArInOcsZxlKRKXVyQ=' 
  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"
    }
  }
}