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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'cb5300fe3cdb1e17c7c23a3e5abc58d7813315a313f9971b07331b1ef47cf5f0' 
  AND token = 'xPT3qv/oOg+n01a1GU27sWMidSxL6ULpHROQiAuCOE4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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