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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6b94dfc1d7ef180f53ed3df70f52360d4dc90d50d3790e024af47496cf39ce79' 
  AND token = 'bl6XFLdFskmlxPTZN3zLV9Ue1EZtG4aD/HgvXy+EmyQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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