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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5cd6bf29f8eea0a8b3510081390b3115ea0c6a9c70a81dc5600398b622698e8c' 
  AND token = 'gU4yI6IdVjtI+Pr4+DWeeB0scLd0b/3JjtmQMIC9Qzs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00047

JSON explain

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