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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f6a5edca2c611a30a5cdae59ba14520fad7489ba434c3b7799aecad9b1ab4770' 
  AND token = '9CDaE8NdLcRIIbOjRk70i77yMkObfS6uMqBR4Hj4A1E=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00078

JSON explain

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