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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '06f6cc8798f5d0435de3a28833fc885ad1e110d14944cfbe5ffa78314eb3ec19' 
  AND token = '7zxfiBMHx7FWzPPcFRNjV0fEuul/ZD6gchh/TMCwdoI=' 
  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"
    }
  }
}