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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5332b719e7b39094593ba9bf43500861a88de450e5d634e3eaed94fa14c9116f' 
  AND token = '2CJdWmeAI1y7/O+YaAZPQt4vQBdjsgNoqfTU/q93jss=' 
  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"
    }
  }
}