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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9743f1bda1f2290162dd40fdb666fa424168b3de32669e02f78da574b11faa0d' 
  AND token = 'gBMHqOacXVkc2ODMREmn5p2g/+s8SxYh7qf4+COnqII=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00048

JSON explain

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