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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '435e55848e67d61c05cdd0584acba8ae927615ab57e4333e6a680831a50402f1' 
  AND token = 'Ha4fQcX582S8oLmuw9+EaxrkMMOtLBQarLw/iqj7ecI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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