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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'fb04051b9924f230d84b751e485949bcba4088eee99f62aa6de6e72a5866b673' 
  AND token = 'VY+2lHcN41Wvi5ye8VlJMMvV0nGm1eBi1q7bu3KwegY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00042

JSON explain

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