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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1e1d93d5b732294a62e5e6f41c91c7243a651da60c2e98ef06446034ec2e8c20' 
  AND token = '8OGzQ19F8S9yAQHNgnLoz0Sluo7GLIRTiVMaN9bwUYs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00043

JSON explain

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