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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f4d4f16ace739facc933ab190d7832d1873e9b335054d3fdf842a0c10601c966' 
  AND token = 'BLoDYgpy3CdgTZ1pHRcX0asncczUugsCfrIl0/6eJ0w=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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