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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '553d9e4bfa32b786143ca74b3a12ec2a70b6be06752ef9adcb3af0ac3a4200a8' 
  AND token = 'XQ2ab9cdKfion0OnHrMddKWSBQVwWw6JsvWfVVyPhAQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00046

JSON explain

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