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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c096252f5b5b0dced1ce6b231634285acee2a04ac647eff9609d6b7f642c2c69' 
  AND token = 'TYdc3Fb54ga+7aErfEakoqEF38HEnlbjVVKRKoX7bDw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00043

JSON explain

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