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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd9f589d1daa6db24080fe4d937dac6bb8478d9ec2be26eaab8c8710b2263ecf7' 
  AND token = 'f/xIo4WjCo0EIiRSKYjoYFXXet9lBMwG3XteR4/sSHo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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