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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '03b130dce2cfd0a605419779de025d21c1b57eb2bd73bba926e489ac67b302f1' 
  AND token = 'i7QOn7bLrxskuHKhlXnm86JFkQfvUaLeSUel1SDy3sI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00044

JSON explain

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