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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd36a54340b9bb5008e1fba6cc15d375b7e1db5007ed46c7cbce9b2a515b0555f' 
  AND token = 'XXB2cEHloyGLBsrVDd2v6dLUilMsGJJw1etjgvS7BaU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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