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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '75fb1e4676a1d8b934bd13a1d3630e61474ea0bdf5e0e655ca1f7edc5cbae536' 
  AND token = 'S6s6+TqHTRCyRSbMshOd+K1jy0n3CcA3eY2VWdN61fM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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