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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'baca89984c1ca07d4f3364a4d74f7621f19d6ed4f319885bd972b23ea1c68c7c' 
  AND token = 'zKit31VyB31lgKQPlq/lCslddJ1dlclYrWbftaU6xzo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00045

JSON explain

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