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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '57d340d3c1f0d436690ea36d7590acdb1001aba40f18e75a6516fd973db787fe' 
  AND token = '7XEiYoS10L9/0y3/zALoUJ72ZnSs0+WZTavqDyWDN2o=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00044

JSON explain

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