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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2b5043495df6381deaa473d57780b8e659925ed1114119572127e35dbc4aa134' 
  AND token = 'k/iwgF2ed0MeSAlwEn4Gw3fL9h6+oa2omi245tI4vz4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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