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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'bd839ade5db8e7e6cfe1a8f721a74eb597ed005e8728e6cda34332a26d7157fc' 
  AND token = 'KNZjNuAC0ti8Nw1XE/GOhlhUd3i9xp3VnFxmTg8VA68=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00044

JSON explain

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