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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '15d1bc7c07d55c99bf0490733b9a5e2515d3c1d29c7401ffd291419e013cded5' 
  AND token = 'oeCI004ZokobJxFuUXLFiK+82jTuaD2bABn0s7t9U1A=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00045

JSON explain

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