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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c2f4451a2201862352b9b7e55102895b55065e58fb8a8269fdd9ab1e2ed32d2d' 
  AND token = 'u6KTfEdP6T/pIEK/AYN6K3elrFLBJfk8FfIOz+AXbFg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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