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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a1f422999952e17ff353ae710e4c0feb246f71088c56a9ee345b6cb5ecd982ed' 
  AND token = 'DL3VhLYMfkuosj+KisEgi9gs94MgZ5Wij5egeWJXvc0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00081

JSON explain

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