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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '412d78105d4451095df14607a25583cc0679fac820c1b847ea8b1be82ff96e9f' 
  AND token = 'opvH0xJeM4/StOIsLpXsDahFiRMi3avvsmn2gNjifXA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00056

JSON explain

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