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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd3ed83e7ba19716f0b62c4df9fa75e43823f043aa4ce6d71cf8431234b95a168' 
  AND token = '2deONo+sAv2mLXUHdnS08wu22ofASZAHw0tZws4xig4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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