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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '350373202d08e2f5a467989becda78545a6c235cf714439b3d81b57368ca112b' 
  AND token = '6qRn06b5a2c9i1NNDHy82+PMR5zx4IY8g/1pAh+Gi2E=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00054

JSON explain

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