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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '487d7653096b67a87d3cf8f0d31ed328cedbdcb5d839a7a2187b539cfc2fbd1b' 
  AND token = '3C0cL8SikMH1csuiIO2Ewqca4kJeWuDxRSdW/iF3SHU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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