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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1bb09dc1b669e0b7d7509e88df48ff6b9f8621ff5b9db9add042bf038b1a35aa' 
  AND token = 'bfa0FL3cvrijRma/Nq6lAXbwJn9q+tDinmEGj/vJaRA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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