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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'eeaf610023f7f5377e649bcfad9ededd7052996ae763e723677a7320a3e56571' 
  AND token = 'S2SFyEzlZDTLqXTb3Q8DNDony9Hhha/TRVhw0Bd3ZVI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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