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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9ff11945ab3fbe464e8ccfd6936e7e8da467e80211205af65575b616c6b94a39' 
  AND token = 'Q2ayw0GomOCZyNpPk6+x4Mfq+P3v+PtisNEL/2p8FtY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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