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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6aa0641a7e57727425f15def3f8f85832c4686cd8176f71dd0e64e95d550df66' 
  AND token = 'pm63Y1PuiUZ1JC3aZAClRn1OGiBpfRvL0M6xjcCF7S4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00050

JSON explain

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