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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '39f5be60cd63b37d327c28b5648e4727cd8c8139c07f1c548897e3811f03405c' 
  AND token = 'prYPAQsXY2xSjyWEWud7t8RPt4WmRTfCza1+pnLnfSw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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