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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3d72419aa08a7f357652ac972f9b8fc55cdb75da36189be209f609c3dd010df6' 
  AND token = 'q7yzyMfo1taa0RV6brABrIlc8VTRMI9RbQv8+6kbyXU=' 
  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"
    }
  }
}